<?php
/**
 * Project:     Rebel PHP Framework
 * File:        Rebel_Config_XMLConfig.php
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * @link http://www.rebelphpframework.org
 * @copyright 2007 Emanuele Colonnelli
 * @author Emanuele Colonnelli <emanuele.colonnelli at gmail dot com>
 * @package kernel
 * @version 1.0
 */

if(define(__FILE__,true)) {

	define('CONFIG_FILE_DIR',realpath(sprintf('%s%s.rebel%sconf%s',
															$_SERVER['DOCUMENT_ROOT'],
															DIRECTORY_SEPARATOR,
															DIRECTORY_SEPARATOR,
															DIRECTORY_SEPARATOR
															)));
	
	class Rebel_Config_XMLConfig {
		
		const 	MAIN_CONFIG_FILE = 'config.xml';
				
		private static 	$configurationFile,
						$instance,
						$xmlObj,
						$xmlData;
		
		/**
		 * @return Rebel_Config_XMLConfig
		 */
		public static function getInstance() {
			return self::$instance ? self::$instance : new self;
		}//:-
		
		/**
		 * getInstance alias shortcut
		 *
		 * @return Rebel_Config_XMLConfig
		 */
		public static function go(){
			return self::getInstance();
		}//:-

		
		private function __construct() {

			if(!file_exists($cfgfile = CONFIG_FILE_DIR . self::MAIN_CONFIG_FILE)) {
				throw new Exception(sprintf('Rebel_Config_XMLConfig: UNABLE TO FIND CONFIG FILE %s',$cfgfile));
			}

 			self::$configurationFile = $cfgfile;

			$doc = new DOMDocument();
			$doc->load(self::$configurationFile);
			self::$xmlObj = new DOMXPath($doc);
			self::$instance = $this;
		}//:-
		
		
		public function __get($var) {
			
			$q = self::$xmlObj->query(sprintf('/config/%s',str_replace('.','/',$var)));
			
			foreach ($q as $v) {
				if($v->nodeValue) {
					return $v->nodeValue;
				} else {
					throw new Exception('XConfig Exception: bad configuration directive request');
				}
			}
		}//:-
		
	}///:-
	
}